Integrated flux of M 82 for the whole galaxy, the core region, and the halo plotted vs. the frequency. The additional point at λ18 cm is from Braun et al. (2007). The integrated emission over the whole galaxy shows a turnover in the spectral index, which can be attributed to free-free absorption processes in the core region. The dashed lines represent the expected flux in case of no free-free absorption.
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